What if it were a Dobson and Palmieri for Marner?
Then sign Ghost.
IDK, I'd be very wary of dealing Dobson. Way too many teams have been burned getting impatient and trading young D while they're going through growing pains. It's up to the brass that sees him in more depth to analyze things, but from my perspective I see a 6'4" kid with great skating and with great skills. Also:
Dobson is 23, is locked up at $4M for the next 2 years, and then is an RFA;
Marner is 26, is locked up at $11M for the next 2 years, and then is a UFA.
And Ghost is looking better with CAR than I thought he was, but I also think that while he's fine on the PP, I'm not sure that he's a difference maker.